JDK VERSION : JDK 11 - AMAZON CORRETTO

  <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.0</version>
                <configuration>
                    <release>11</release>
                    <source>11</source>
                    <target>11</target>
                </configuration>
            </plugin>
   </plugins>

• composition vs inheritance

  examples code

• equals vs referance

  examples code

• iterators

  Iterators & ListIterator & Spliterator

  examples code

• collection differance

  ArrayList vs HashSet

  HashSet vs LinkedHashSet vs TreeSet

  ArrayList vs LinkedList

  Vector vs ArrayList

  examples code

• map differance

  HashMap vs LinkedHashMap vs TreeMap

  HashMap vs ConcurrentHashMap

  examples code

• Class structure

  Inner & Static & Local Class and properties access

  examples code

• interface vs abstract

  examples code

• sorting

  Array sorting

  List sorting

  Map sorting

  Set sorting

  Comparable vs Comparator

  Sorting algorithms

  examples code

• String Pooling vs StringBuilder vs StringBuffer

  examples code

• Binary search

  Iteration

  Recursive

  examples code

• Ternary search

  examples code

• Hierarchical Data Structure

  Binary Tree

  Binary Search Tree

  Binary Heap

  examples code

• error vs exception

  examples code

• LinkedList

  examples code

• Complexity

  Constant Time

  Linear Time

  Logarithmic Time

  N Log N Time

  Polynomial Time

  Quadratic Time

  examples code

• Reflection

  examples code

• Custom Annotation

  Target

  Retention

  Inherited

  examples code

• Lambda

  Coupling

  Decoupling

  Functional Interface

  • Consumer

  • Function

  • Predicate

  • Supplier

  examples code